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kiirus, millega levib elektromagnetkiirgus, sealhulgas valgus, fundamentaalne füüsikakonstant, mille fikseeritud väärtus vaakumis on 299 792 458 m/s, fundamental physical constant the value of which has been fixed at exactly 299 792 458 m/s with the definition of the metre in SI
valguse kiirus . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/valguse%20kiirus/1/est (21.06.2026)
